claude garrett
Published © GPL3+

Wii Balance Board Cloud Scale

Make it easy to track your daily weigh-ins by automatically transmitting your weight to the cloud using AWS!

EasyFull instructions provided6,240
Wii Balance Board Cloud Scale

Things used in this project

Hardware components

Raspberry Pi 1 Model A+
Raspberry Pi 1 Model A+
×1
Wii Balance Board
×1
Bluetooth Dongle
×1

Software apps and online services

AWS IoT
Amazon Web Services AWS IoT

Story

Read more

Schematics

WiiScale Diagram

Raspberry Pi connections to the internet (ethernet), power, wireless keyboard, monitor and bluetooth.
Wiiscale%20schematic

Code

mqtt-wiiboard.py

Python
This python code will connect with the Wii Balance Board and upload your weight to AWS.
#!/usr/bin/env python

#for wii balance board
import collections
import time
import bluetooth
import sys
import subprocess

#for mqtt
import sys                                 
import ssl
import json
import time
import paho.mqtt.client as mqtt

#---------- mqtt init -------------
def on_publish(mosq, obj, mid):
    print("published")

def on_connect(mqttc, obj, flags, rc):
    if rc==0:
        print ("Connection successful")
    elif rc==1:
        print ("Connection refused")
    return

def on_disconnect(client, userdata, rc):
    print("disonnected")

mqttc = mqtt.Client(client_id="RaspberryPi")


mqttc.on_publish = on_publish
mqttc.on_connect = on_connect
mqttc.on_disconnect = on_disconnect

mqttc.tls_set("./certs/root-CA.crt",
                certfile="./certs/certificate.pem.crt",
                keyfile="./certs/private.pem.key",
                tls_version=ssl.PROTOCOL_TLSv1_2, 
                ciphers=None)

mqttc.connect("A2BLAHBLAHBLAH.iot.us-west-2.amazonaws.com",8883)
mqttc.loop_start()
#----------------------------------

# --------- User Settings ---------
WEIGHT_SAMPLES = 500
# ---------------------------------

# Wiiboard Parameters
CONTINUOUS_REPORTING = "04"  # Easier as string with leading zero
COMMAND_LIGHT = 11
COMMAND_REPORTING = 12
COMMAND_REQUEST_STATUS = 15
COMMAND_REGISTER = 16
COMMAND_READ_REGISTER = 17
INPUT_STATUS = 20
INPUT_READ_DATA = 21
EXTENSION_8BYTES = 32
BUTTON_DOWN_MASK = 8
TOP_RIGHT = 0
BOTTOM_RIGHT = 1
TOP_LEFT = 2
BOTTOM_LEFT = 3
BLUETOOTH_NAME = "Nintendo RVL-WBC-01"


class EventProcessor:
    def __init__(self):
        self._measured = False
        self.done = False
        self._measureCnt = 0
        self._events = range(WEIGHT_SAMPLES)

    def mass(self, event):
        if (event.totalWeight > 2):
            self._events[self._measureCnt] = event.totalWeight*2.20462
            self._measureCnt += 1
            if self._measureCnt == WEIGHT_SAMPLES:
                self._sum = 0
                for x in range(0, WEIGHT_SAMPLES-1):
                    self._sum += event.totalWeight*2.20462
                self._weight = self._sum/WEIGHT_SAMPLES
                self._measureCnt = 0
                print str(self._weight) + " lbs"
                #publish ----------------------------------------------
                jsonstr = '{"DeviceId":0,"Readings":{"label":"Weight","data":' + str(self._weight) + '}}'
                jsonReading = json.loads(jsonstr)
                payloadJson = {}
                payloadJson['state'] = {}
                payloadJson['state']['desired'] = jsonReading
                mqttc.publish("$aws/things/<thing name>/shadow/update", json.dumps(payloadJson) , qos = 1)
                #------------------------------------------------------
            if not self._measured:
                self._measured = True

    @property
    def weight(self):
        if not self._events:
            return 0
        histogram = collections.Counter(round(num, 1) for num in self._events)
        return histogram.most_common(1)[0][0]


class BoardEvent:
    def __init__(self, topLeft, topRight, bottomLeft, bottomRight, buttonPressed, buttonReleased):

        self.topLeft = topLeft
        self.topRight = topRight
        self.bottomLeft = bottomLeft
        self.bottomRight = bottomRight
        self.buttonPressed = buttonPressed
        self.buttonReleased = buttonReleased
        #convenience value
        self.totalWeight = topLeft + topRight + bottomLeft + bottomRight

class Wiiboard:
    def __init__(self, processor):
        # Sockets and status
        self.receivesocket = None
        self.controlsocket = None

        self.processor = processor
        self.calibration = []
        self.calibrationRequested = False
        self.LED = False
        self.address = None
        self.buttonDown = False
        for i in xrange(3):
            self.calibration.append([])
            for j in xrange(4):
                self.calibration[i].append(10000)  # high dummy value so events with it don't register

        self.status = "Disconnected"
        self.lastEvent = BoardEvent(0, 0, 0, 0, False, False)

        try:
            self.receivesocket = bluetooth.BluetoothSocket(bluetooth.L2CAP)
            self.controlsocket = bluetooth.BluetoothSocket(bluetooth.L2CAP)
        except ValueError:
            raise Exception("Error: Bluetooth not found")

    def isConnected(self):
        return self.status == "Connected"

    # Connect to the Wiiboard at bluetooth address <address>
    def connect(self, address):
        if address is None:
            print "Non existant address"
            return
        self.receivesocket.connect((address, 0x13))
        self.controlsocket.connect((address, 0x11))
        if self.receivesocket and self.controlsocket:
            print "Connected to Wiiboard at address " + address
            self.status = "Connected"
            self.address = address
            self.calibrate()
            useExt = ["00", COMMAND_REGISTER, "04", "A4", "00", "40", "00"]
            self.send(useExt)
            self.setReportingType()
            print "Wiiboard connected"
        else:
            print "Could not connect to Wiiboard at address " + address

    def receive(self):
        while self.status == "Connected" and not self.processor.done:
            data = self.receivesocket.recv(25)
            intype = int(data.encode("hex")[2:4])
            if intype == INPUT_STATUS:
                # TODO: Status input received. It just tells us battery life really
                self.setReportingType()
            elif intype == INPUT_READ_DATA:
                if self.calibrationRequested:
                    packetLength = (int(str(data[4]).encode("hex"), 16) / 16 + 1)
                    self.parseCalibrationResponse(data[7:(7 + packetLength)])

                    if packetLength < 16:
                        self.calibrationRequested = False
            elif intype == EXTENSION_8BYTES:
                self.processor.mass(self.createBoardEvent(data[2:12]))
            else:
                print "ACK to data write received"

    def disconnect(self):
        if self.status == "Connected":
            self.status = "Disconnecting"
            while self.status == "Disconnecting":
                self.wait(100)
        try:
            self.receivesocket.close()
        except:
            pass
        try:
            self.controlsocket.close()
        except:
            pass
        print "WiiBoard disconnected"

    # Try to discover a Wiiboard
    def discover(self):
        print "Press the red sync button on the board now"
        address = None
        bluetoothdevices = bluetooth.discover_devices(duration=6, lookup_names=True)
        for bluetoothdevice in bluetoothdevices:
            if bluetoothdevice[1] == BLUETOOTH_NAME:
                address = bluetoothdevice[0]
                print "Found Wiiboard at address " + address
        if address is None:
            print "No Wiiboards discovered."
        return address

    def createBoardEvent(self, bytes):
        buttonBytes = bytes[0:2]
        bytes = bytes[2:12]
        buttonPressed = False
        buttonReleased = False

        state = (int(buttonBytes[0].encode("hex"), 16) << 8) | int(buttonBytes[1].encode("hex"), 16)
        if state == BUTTON_DOWN_MASK:
            buttonPressed = True
            if not self.buttonDown:
                print "Button pressed"
                self.buttonDown = True

        if not buttonPressed:
            if self.lastEvent.buttonPressed:
                buttonReleased = True
                self.buttonDown = False
                print "Button released"

        rawTR = (int(bytes[0].encode("hex"), 16) << 8) + int(bytes[1].encode("hex"), 16)
        rawBR = (int(bytes[2].encode("hex"), 16) << 8) + int(bytes[3].encode("hex"), 16)
        rawTL = (int(bytes[4].encode("hex"), 16) << 8) + int(bytes[5].encode("hex"), 16)
        rawBL = (int(bytes[6].encode("hex"), 16) << 8) + int(bytes[7].encode("hex"), 16)

        topLeft = self.calcMass(rawTL, TOP_LEFT)
        topRight = self.calcMass(rawTR, TOP_RIGHT)
        bottomLeft = self.calcMass(rawBL, BOTTOM_LEFT)
        bottomRight = self.calcMass(rawBR, BOTTOM_RIGHT)
        boardEvent = BoardEvent(topLeft, topRight, bottomLeft, bottomRight, buttonPressed, buttonReleased)
        return boardEvent

    def calcMass(self, raw, pos):
        val = 0.0
        #calibration[0] is calibration values for 0kg
        #calibration[1] is calibration values for 17kg
        #calibration[2] is calibration values for 34kg
        if raw < self.calibration[0][pos]:
            return val
        elif raw < self.calibration[1][pos]:
            val = 17 * ((raw - self.calibration[0][pos]) / float((self.calibration[1][pos] - self.calibration[0][pos])))
        elif raw > self.calibration[1][pos]:
            val = 17 + 17 * ((raw - self.calibration[1][pos]) / float((self.calibration[2][pos] - self.calibration[1][pos])))

        return val

    def getEvent(self):
        return self.lastEvent

    def getLED(self):
        return self.LED

    def parseCalibrationResponse(self, bytes):
        index = 0
        if len(bytes) == 16:
            for i in xrange(2):
                for j in xrange(4):
                    self.calibration[i][j] = (int(bytes[index].encode("hex"), 16) << 8) + int(bytes[index + 1].encode("hex"), 16)
                    index += 2
        elif len(bytes) < 16:
            for i in xrange(4):
                self.calibration[2][i] = (int(bytes[index].encode("hex"), 16) << 8) + int(bytes[index + 1].encode("hex"), 16)
                index += 2

    # Send <data> to the Wiiboard
    # <data> should be an array of strings, each string representing a single hex byte
    def send(self, data):
        if self.status != "Connected":
            return
        data[0] = "52"

        senddata = ""
        for byte in data:
            byte = str(byte)
            senddata += byte.decode("hex")

        self.controlsocket.send(senddata)

    #Turns the power button LED on if light is True, off if False
    #The board must be connected in order to set the light
    def setLight(self, light):
        if light:
            val = "10"
        else:
            val = "00"

        message = ["00", COMMAND_LIGHT, val]
        self.send(message)
        self.LED = light

    def calibrate(self):
        message = ["00", COMMAND_READ_REGISTER, "04", "A4", "00", "24", "00", "18"]
        self.send(message)
        self.calibrationRequested = True

    def setReportingType(self):
        bytearr = ["00", COMMAND_REPORTING, CONTINUOUS_REPORTING, EXTENSION_8BYTES]
        self.send(bytearr)

    def wait(self, millis):
        time.sleep(millis / 1000.0)


def main():
    processor = EventProcessor()

    board = Wiiboard(processor)
    if len(sys.argv) == 1:
        print "Discovering board..."
        address = board.discover()
    else:
        address = sys.argv[1]

    try:
        # Disconnect already-connected devices.
        # This is basically Linux black magic just to get the thing to work.
        subprocess.check_output(["bluez-test-input", "disconnect", address], stderr=subprocess.STDOUT)
        subprocess.check_output(["bluez-test-input", "disconnect", address], stderr=subprocess.STDOUT)
    except:
        pass

    print "Trying to connect..."
    board.connect(address)  # The wii board must be in sync mode at this time
    board.wait(200)
    # Flash the LED so we know we can step on.
    board.setLight(False)
    board.wait(500)
    board.setLight(True)
    board.receive()

if __name__ == "__main__":
    main()

Credits

claude garrett

claude garrett

9 projects • 9 followers

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